KR20070015676A - SRNS Relocating Method for Handover Between Asynchronous Communication Network and Synchronous Communication Network - Google Patents

Abstract

The present invention relates to a method for switching a handover between an asynchronous network and a synchronous network in which a mobile communication terminal switches to a wireless network controller storing synchronization network information as a mobile communication terminal located in an asynchronous network moves to a synchronous network. It is about.

According to an embodiment of the present invention, as a mobile communication terminal located in an asynchronous network moves to a synchronous network side, a first wireless network controller may include a second mobile station located at a boundary area between an asynchronous network and a synchronous network in which the mobile communication terminal previously stored synchronization cell information. Transmitting a connection switch request signal to the second wireless network controller to switch to a wireless network controller; A second step of the mobile communication terminal performing connection switching to the second wireless network controller as the second wireless network controller transmits a response to the connection switching request signal to the first wireless network controller; And a third step of controlling, by the second radio network controller, the mobile communication terminal so that the mobile communication terminal performs a handover to the synchronous network, as the mobile communication terminal located in the asynchronous network moves to the synchronous network side. In addition, since the mobile communication terminal switches the connection to the corresponding wireless network controller that stores the synchronization cell information matched with the asynchronous cell, the success rate of handover from the asynchronous network to the synchronous network can be improved.

 Handover, Transfer

Description

SRNS Relocating Method for Handover Between Asynchronous Communication Network and Synchronous Communication Network}

1 is a view showing the configuration of a communication network according to the present invention;

2 is a view for briefly explaining a connection switching method for handover between an asynchronous network and a synchronous network according to the present invention;

3 is a flowchart illustrating a connection switching method for handover between an asynchronous network and a synchronous network according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: mobile communication terminal 20: asynchronous mobile communication system A

30: asynchronous mobile communication system B 40: synchronous mobile communication system

50: IP network 210, 310: Node B

220, 320: RNC 230, 330: Asynchronous MSC

240, 340: SGSN 250, 350: GPRS

260, 360: GGSN 410: BTS

420: BSC / PCF 430: MSC

440 PDSN (FA) 450 HA

460: AAA

The present invention relates to a connection switching method for handover between an asynchronous network and a synchronous network, and more particularly, to a wireless network controller storing synchronous network information as a mobile communication terminal located in an asynchronous network moves to a synchronous network. The present invention relates to a connection switching method for handover between an asynchronous network and a synchronous network that a mobile communication terminal switches to.

Currently, there are four methods for performing a handover by a mobile communication terminal in a mobile communication network in which an asynchronous network and a synchronous network overlap. First, when the base station requests the mobile communication terminal to report the received electric field, the mobile communication terminal reports the received electric field, and the base station refers to the received electric field strength transmitted from the mobile communication terminal. It is a method of transmitting information necessary for handover to a mobile communication terminal and a base station of a neighboring cell so that handover can be performed to a synchronous base station designated by the user. When the mobile communication terminal enters the border zone, the base station transmits the information necessary for handover to the mobile communication terminal and the neighboring cell base station so that the mobile station can perform the handover to the synchronous base station designated by the operator. That's how.

The third method is to place a beacon in the synchronization cell in the boundary area of the asynchronous cell and to allow the beacon to send an asynchronous frequency to induce a handover of the mobile communication terminal. After receiving and storing the specified received electric field threshold value from the base station, and measuring the strength of the received electric field by itself, when the threshold is reached, the mobile communication terminal reports synchronous neighbor cell information of the currently located cell to the base station and requests handover. to be.

In the aforementioned method for handover of a mobile communication terminal from an asynchronous network to a synchronous network, the wireless network controller stores synchronization cell information of an asynchronous network boundary cell where a handover occurs from the asynchronous network to the synchronous network. This is a method of converting a call to a synchronous call according to an over trigger condition.

However, after the mobile communication terminal performs a handover through the Iur interface, which is a wireless network control period interface, that is, performs a handover to another wireless network controller that does not store the synchronization cell information in the asynchronous network, the asynchronous network from the asynchronous network When the handover is triggered, the wireless network controller does not store the synchronization cell information. Therefore, the wireless network controller cannot know the mapping relationship between the synchronization cell and the asynchronous cell. There is a problem that can not be made smoothly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. When a mobile communication terminal located in an asynchronous network moves to a synchronous network side, the mobile communication terminal switches access to a wireless network controller that stores synchronous network information matching the asynchronous network. There is a technical problem to provide a connection switching method for handover between an asynchronous network and a synchronous network.

In the communication network in which the asynchronous mobile communication system including the wireless network controller and the synchronous mobile communication system overlap each other, the handover is performed from the asynchronous mobile communication system to the synchronous mobile communication system according to the movement of the mobile communication terminal. As a connection switching method for handover between an asynchronous network and a synchronous network,

As the mobile communication terminal located in the asynchronous network moves to the synchronous network side, the first wireless network controller is a second wireless network controller located at the boundary area between the asynchronous network and the synchronous network in which the mobile communication terminal previously stored synchronization cell information. A first step of transmitting a connection request signal to the second wireless network controller to switch access to the network; A second step of the mobile communication terminal performing connection switching to the second wireless network controller as the second wireless network controller transmits a response to the connection switching request signal to the first wireless network controller; And a third step of the second wireless network controller controlling the mobile communication terminal so that the mobile communication terminal performs a handover to the synchronization network.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the configuration of a communication network according to the present invention.

The mobile communication terminal 10 is capable of simultaneously providing an asynchronous mobile communication service and a synchronous mobile communication service. The mobile communication terminal 10 is optional with the asynchronous mobile communication system A 20, the asynchronous mobile communication system B 30, and the synchronous mobile communication system 40. By wireless connection, voice or data service can be used.

The asynchronous mobile communication system A 20 is a Node B 210 as a base station for wireless section communication with the mobile communication terminal 10, a radio network controller (RNC) for controlling the Node B 210 (hereinafter referred to as 'first radio'). Network controller 220), an asynchronous switch (asynchronous MSC, 230) connected to the first wireless network controller 220 to perform a call exchange for providing a voice service to the mobile communication terminal 10, the first A Serving GPRS Support Node (SGSN) 240 connected between the radio network controller 220 and the general packet radio service (GPRS) network 250 to maintain a location track of the mobile communication terminal 10 and perform access control and security functions. ), The Gateway GPRS Support Node (GGSN) 260 connected to the SGSN 240 and the General Packet Radio Service (GPRS) network 250 and connected to the IP network 40 to support interworking with external packets. do.

In addition, the first wireless network controller 220 of the asynchronous mobile communication system A 20 moves the mobile communication terminal 10 located in the asynchronous mobile communication system A 20 area to the asynchronous mobile communication system B 30 area. If so, the mobile communication terminal 10 transmits a connection switch request signal to the second radio network controller 320 that stores the synchronization cell information mapped to the asynchronous cell so as to perform a handover to the synchronization network.

The asynchronous mobile communication system B 30 includes a Node B 310, a radio network controller (RNC: second wireless network controller hereinafter) 320, an asynchronous switch (asynchronous MSC) 330, SGSN 340, GPRS network 350 and GGSN 360, and the role of each component is the same as the asynchronous mobile communication system A (20), a detailed description thereof will be omitted.

The second radio network controller 320 of the asynchronous mobile communication system B 30 receives the connection switching request signal transmitted from the asynchronous mobile communication system A 20 as the mobile communication terminal 10 moves to the synchronous network side. In response, the response to the connection switch request signal is transmitted to the asynchronous mobile communication system A 20, so that the connection switching from the asynchronous mobile communication system A 20 to the asynchronous mobile communication system B 30 is achieved.

The synchronous mobile communication system 40 is a base station (BTS, 410) for supporting wireless communication with the mobile communication terminal 10, a base station controller (BSC) for controlling the base station 410 and radio resource management for packet data service A packet control function (PCF) 420 that performs a role similar to that of a base station controller (BSC) when providing a packet data service, and a switch (MSC) connected to one or more base station controllers 420 to perform a call exchange. 430, connected to the packet controller 420, establishes a Point to Point Protocol (PPP) session with the mobile communication terminal 10, performs a connection with an external node, and an external agent for location registration of the mobile communication terminal 10. (Foreign Agent; FA) data packet to support the connection between the packet data service node (PDSN, 440), packet data service node 440 and IP network 50 for providing a packet data service to the subscriber Network (DCN, not shown), home agent (450) for performing authentication of the mobile communication terminal 10 and delivering packet data to an external agent, authentication (authentication), authorization of the mobile communication terminal ( AAA 460 that performs Authorization and Accounting functions.

Although not shown, the asynchronous mobile communication system B 30 and the switchboards 330 and 430 of the synchronous mobile communication system 40 are interconnected by a No. 7 common signal network and connected to a handover of the mobile communication terminal 10 or the like. Send and receive the necessary information.

In such a mobile communication system, the mobile communication terminal 10 of the present invention is selectively connected to the asynchronous mobile communication systems 20 and 30 and the synchronous mobile communication system 40 to transmit and process the signal processing situation of both systems.

The second wireless network controller 320 of the asynchronous mobile communication system B 30 shown in FIG. 1 is located in the boundary area where the asynchronous network and the synchronous network overlap, and the mobile communication terminal 10 is a handed synchronous network. Stores sync cell information mapped to asynchronous cell required to perform over.

2 is a view for briefly explaining a connection switching method for handover between an asynchronous network and a synchronous network according to the present invention.

The first wireless network controller 220 which communicates with the mobile communication terminal 10 located in the asynchronous network moves as the mobile communication terminal 10 moves to the boundary area between the asynchronous network and the synchronous network (①). The communication terminal 10 switches the connection to the second radio network controller 320 storing the sync cell information.

Then, as the mobile communication terminal 10 moves to the synchronization network side (②), the second wireless network controller 320 communicating with the mobile communication terminal 10 communicates with the synchronous mobile communication system 40. By doing so, the mobile communication terminal 10 performs a handover to a synchronous network.

Here, when the mobile communication terminal 10 moves to the boundary area between the asynchronous network and the synchronous network, when the first wireless network controller 220 transmits a connection switch request signal to the second wireless network controller 320. The mobile communication terminal 10 is classified into three types according to the handover mode. The first is a case where the mobile communication terminal 10 enters a boundary area where an asynchronous network and a synchronous network overlap, and the second is a mobile. This is a case where a wireless network controller cell to which the communication terminal 10 can switch access is added, and the third includes information on a dummy cell among measurement information transmitted from the mobile communication terminal 10. If yes.

Subsequently, when the mobile communication terminal 10 switches to the second wireless network controller 320, the second wireless network controller 320 may control the mobile communication terminal 10 to perform handover to the synchronous network. You have the right to

3 is a flowchart illustrating a connection switching method for handover between an asynchronous network and a synchronous network according to the present invention.

As the mobile communication terminal 10 located in the asynchronous network moves to the synchronous network side, the first wireless network controller 220 communicating with the mobile communication terminal 10 changes the handover mode of the mobile communication terminal 10. Check (S101).

In step S101, the handover mode of the mobile communication terminal 10 is a first mode in which the base station requests and receives a reception electric field from the mobile communication terminal 10 and performs a handover based on this, and the mobile communication terminal 10 As the mobile communication terminal 10 moves to the boundary area between the asynchronous network and the synchronous network as it moves to the synchronous network side (S103), the first wireless network controller 220 stores the synchronous cell information by the mobile communication terminal 10. The access switch request signal is transmitted to the second wireless network controller 320 to perform a handover to the synchronous network by switching to the second wireless network controller 320 in step S109.

Thereafter, as the second wireless network controller 320 transmits a response to the connection switch request signal to the first wireless network controller 220, the mobile communication terminal 10 switches to the second wireless network controller 320. Perform (S111).

The second radio network controller 320 controls the mobile communication terminal 10 so that the mobile communication terminal 10 performs a handover to a synchronous network (S113).

On the other hand, as a result of step S101, when the handover mode of the mobile communication terminal 10 divides the cell of the asynchronous network into two parts of the border area and the active area, when the mobile communication terminal 10 enters the border area, the base station is a guardian of the adjacent cell. In the second mode of providing information necessary for handover to the station, as the mobile communication terminal 10 moves to the synchronous network side, the wireless network controller cell to which the mobile communication terminal 10 can be switched is connected. When added (S105), the first radio network controller 220 switches the mobile communication terminal 10 to the second radio network controller 320, which stores the synchronization cell information, to perform a handover to the synchronization network. The connection switch request signal is transmitted to the second wireless network controller 320 (S109).

Thereafter, steps S111 and S113 are performed.

On the other hand, as a result of step S101, the handover mode of the mobile communication terminal 10 sets the beacon to the synchronization cell in the boundary area of the asynchronous cell, and the beacon transmits an asynchronous frequency to induce the handover of the mobile communication terminal 10. In the third mode, when the mobile communication terminal 10 moves to the synchronous network, when the dummy cell information among the measurement information transmitted from the mobile communication terminal 10 is confirmed (S107), the first wireless network controller 220 The mobile communication terminal 10 switches the connection request signal to the second wireless network controller 320 so as to perform a handover to the second wireless network controller 320 storing the synchronization cell information and performing a handover to the synchronized network. It transmits (S109).

Thereafter, steps S111 and S113 are performed.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, in the method for switching a handover between the asynchronous network and the synchronous network, the mobile communication terminal located in the asynchronous network moves to the synchronous network, so that the mobile communication terminal matches synchronous cell information matching the asynchronous cell. Since the connection is switched to the corresponding wireless network controller, the success rate of handover from the asynchronous network to the synchronous network can be improved.

Claims (4)

In a communication network in which an asynchronous mobile communication system including a wireless network controller and a synchronous mobile communication system overlap, asynchronous network and synchronous network for performing handover from the asynchronous mobile communication system to the synchronous mobile communication system according to the movement of the mobile communication terminal. As a connection switching method for handover of As the mobile communication terminal located in the asynchronous network moves to the synchronous network side, the first wireless network controller is a second wireless network controller located at the boundary area between the asynchronous network and the synchronous network in which the mobile communication terminal previously stored synchronization cell information. A first step of transmitting a connection request signal to the second wireless network controller to switch access to the network; A second step of the mobile communication terminal performing connection switching to the second wireless network controller as the second wireless network controller transmits a response to the connection switching request signal to the first wireless network controller; And A third step of controlling, by the second radio network controller, the mobile communication terminal so that the mobile communication terminal performs handover to the synchronization network; Connection switching method for the handover between the asynchronous network and the synchronous network comprising a. The method of claim 1, The first step is, When the wireless network controller cell to which the mobile communication terminal is to be connected is added, the first wireless network controller transmits a connection switch request signal to the second wireless network controller. Connection switching method for handover between network and synchronous network. The method of claim 1, The first step is, When the mobile communication terminal moves to the boundary area between the asynchronous network and the synchronous network, the first wireless network controller transmits a connection switch request signal to the second wireless network controller. Connection method for handover. The method of claim 1, The first step is, When the information on the dummy cell (Dummy Cell) of the measurement information transmitted from the mobile communication terminal is confirmed, the first wireless network controller is characterized in that the step of transmitting a connection switch request signal to the second wireless network controller Connection switching method for handover between an asynchronous network and a synchronous network.

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